Britney Spears vs. Demi Lovato

Britney Spears and Demi Lovato both got their start on Disney. They’ve both battled personal demons in the public eye, and now they’re both judging The X Factor.

But do they hate each other?

“Tensions are at the boiling point,” a show insider tells Star (via OK!). “There is a bitter rivalry between them, and it’s already pretty much exploded — which is crazy considering how early into filming it is.”

“Demi thinks Britney is a twit, and Britney thinks Demi is beneath her,” another source says. “They avoid each other as much as possible when the cameras aren’t rolling.”